Facts
Your brain weighs about 3 pounds (1,300-1,400 g).

Your brain has about 100,000,000,000 (100 billion) neurons.

The total surface area of your cerebral cortex is about 2500 sq. cm

Unconsciousness will occur after 8-10 seconds after loss of blood supply to your brain.

Neurons multiply at a rate 250,000 neurons/minute during early pregnancy.

You have 12 pairs of cranial nerves.

You have 31 pairs of spinal nerves.

There are about 13,500,000 neurons in your spinal cord.

You can hear in the range of 20 Hz to 20,000 Hz.

There are 1,000 to 10,000 synapses for your “typical” neuron.